Reduction of Common Mode Voltage for 3-Level Inverter Fed DTC of open end Winding Induction Motor Drive

Authors

  • S. Sarada
  • N. Ravisankara Reddy
  • C. Ganesh

Abstract

A scalar based carrier comparison Reduced Common Mode Voltage Pulse Width Modulated (RCMVPWM) schemes is implemented for 3-level dual inverter fed Direct Torque Control (DTC) of Open End Winding Induction Motor (OEWIM drive). In scalar based approach, the modulating signal is obtained by adding zero sequence signal to sinusoidal signal. In this paper, a simplified Space Vector Pulse Width Modulation (SVPWM), RCMVPWM algorithms such as Active Zero State Pulse Width Modulation (AZSPWM) and Near State Pulse Width Modulation (NSPWM) algorithms were obtained by scalar approach. SVPWM algorithm utilizes zero voltage vectors which are responsible for generation of CMV. Moreover, the CMV injects Common Mode Currents (CMC) into the bearings. As a result, the bearings were damaged. Since the RCMVPWM techniques were not utilized zero voltage vectors and therefore CMV is reduced significantly. The analysis of CMV and the Total Harmonic Distortion in stator current of induction motor carried out in this paper. The present work can be illustrated by the simulation results of the MATLAB.

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Published

2020-02-08

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Section

Articles